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. 1977 May;59(5):1000–1003. doi: 10.1104/pp.59.5.1000

Auxin Has No Effect on Modification of External pH by Soybean Hypocotyl Cells 1

Larry N Vanderhoef a,2, Janice S Findley a, John J Burke a, Wayne E Blizzard a
PMCID: PMC543350  PMID: 16659937

Abstract

The cellular adjustment of the pH of the external environment of soybean (Glycine max) hypocotyl elongating cells, frequently assumed to be hydrogen ion secretion when the pH is lowered, is unaffected by auxin. These elongating cells actively adjust the external hydrogen ion concentration (from any pH in the range of 4-8) to pH 5.4 + 0.2. This pH adjustment occurs in a medium which does not contain potassium. Growth-optimum auxin concentrations have no effect on cellular pH adjustment of the external medium, whether added at the beginning of the experiment or after the equilibrium pH is attained. The pH adjustment by the cells occurs rapidly and in spite of the presence of a cuticle.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

  1. Barkley G. M., Leopold A. C. Comparative effects of hydrogen ions, carbon dioxide, and auxin on pea stem segment elongation. Plant Physiol. 1973 Jul;52(1):76–78. doi: 10.1104/pp.52.1.76. [DOI] [PMC free article] [PubMed] [Google Scholar]
  2. Cleland R. E. Hydrogen Ion Entry as a Controlling Factor in the Acid-growth Response of Green Pea Stem Sections. Plant Physiol. 1975 Mar;55(3):547–549. doi: 10.1104/pp.55.3.547. [DOI] [PMC free article] [PubMed] [Google Scholar]
  3. Cleland R. E. Kinetics of Hormone-induced H Excretion. Plant Physiol. 1976 Aug;58(2):210–213. doi: 10.1104/pp.58.2.210. [DOI] [PMC free article] [PubMed] [Google Scholar]
  4. Cleland R. Auxin-induced hydrogen ion excretion from Avena coleoptiles. Proc Natl Acad Sci U S A. 1973 Nov;70(11):3092–3093. doi: 10.1073/pnas.70.11.3092. [DOI] [PMC free article] [PubMed] [Google Scholar]
  5. Evans M. L., Ray P. M., Reinhold L. Induction of coleoptile elongation by carbon dioxide. Plant Physiol. 1971 Mar;47(3):335–341. doi: 10.1104/pp.47.3.335. [DOI] [PMC free article] [PubMed] [Google Scholar]
  6. Jacobs M., Ray P. M. Rapid Auxin-induced Decrease in Free Space pH and Its Relationship to Auxin-induced Growth in Maize and Pea. Plant Physiol. 1976 Aug;58(2):203–209. doi: 10.1104/pp.58.2.203. [DOI] [PMC free article] [PubMed] [Google Scholar]
  7. Vanderhoef L. N., Lu T. Y., Williams C. A. Comparison of Auxin-induced and Acid-induced Elongation in Soybean Hypocotyl. Plant Physiol. 1977 May;59(5):1004–1007. doi: 10.1104/pp.59.5.1004. [DOI] [PMC free article] [PubMed] [Google Scholar]
  8. Vanderhoef L. N., Stahl C. A., Lu T. Y. Two elongation responses to auxin respond differently to protein synthesis inhibition. Plant Physiol. 1976 Sep;58(3):402–404. doi: 10.1104/pp.58.3.402. [DOI] [PMC free article] [PubMed] [Google Scholar]
  9. Vanderhoef L. N., Stahl C. A. Separation of two responses to auxin by means of cytokinin inhibition. Proc Natl Acad Sci U S A. 1975 May;72(5):1822–1825. doi: 10.1073/pnas.72.5.1822. [DOI] [PMC free article] [PubMed] [Google Scholar]
  10. Vanderhoef L. N., Stahl C. A., Williams C. A., Brinkmann K. A. Additional evidence for separable responses to auxin in soybean hypocotyl. Plant Physiol. 1976 May;57(5):817–819. doi: 10.1104/pp.57.5.817. [DOI] [PMC free article] [PubMed] [Google Scholar]

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